A two-wire automatic fire alarm system

Abstract

The invention provides a two-wire automatic fire alarm system, comprising: a two-wire bus, a fire alarm controller, an input and output module, and fire-fighting equipment; the fire alarm controller is respectively connected to the input-output module and the fire-fighting equipment through the two-wire bus; The two-wire bus is provided with a power supply path and a signal path to realize power supply and control signal communication transmission. The system only sets up a power supply path and a signal path to realize power supply and control signal communication transmission. The system realizes two-wire connection without DC24V power line. The input and output modules in the system have their own energy storage circuit, and the output voltage is always maintained at DC30v, which is not affected by the length and diameter of the line, and can meet the needs of starting high-current pulse equipment in various environments. The whole system does not need to use DC24V power lines, only need to lay two alarm buses, there will be no wrong connection or mixed connection phenomenon, the construction is simple, and the construction cost can be effectively reduced.

Description

technical field [0001] The invention relates to a fire alarm system, in particular to a two-wire automatic fire alarm system. Background technique [0002] With the development of my country's economy, the automatic fire alarm system plays an increasingly important role in the construction industry, and the automatic fire alarm equipment is also developing rapidly. From the earliest multi-wire system, N+4-wire system, N+ The 1-wire system has developed to the current four-wire system technology. The fire protection construction becomes more and more simple, and the construction cost is greatly reduced. [0003] The four-wire technology has been used since the 1990s, and it has been developed for more than 20 years. Its technology has been continuously matured and improved, but there are always some technical difficulties in the four-wire technology that cannot be solved. There are certain potential safety hazards in the automatic alarm system, as follows: [0004] Power su...

AI Technical Summary

Problems solved by technology

[0003] The four-wire technology has been used since the 1990s, and it has been developed for more than 20 years. Its technology has been continuously matured and improved, but there are always some technical difficulties in the four-wire technology that cannot be solved.

[0004] Power supply voltage drop problem caused by too long line

In the four-wire system, the DC24V power supply is generally placed in the control center to radiate outwards, which will cause the DC24V line to be too long, the line resistance will be large, and the voltage drop of the line will increase, which will easily cause the terminal voltage to be lower than the normal working voltage.

[0008] ① Once the DC24V DC power supply fails, the entire automatic fire alarm system will have no DC24V power supply, resulting in the paralysis of the entire system

[0009] ② Once the DC24V line is short-circuited due to a certain point of damage or a certain equipment failure, it will cause the entire DC24V line to fail to operate normally, and the entire system will be paralyzed

[0010] ③If multiple single buildings share one power supply and there are many linked devices, once the linked devices start, the starting current is too large, which will cause overload of the power supply and make it more difficult to guarantee the stability of the system

But this kind of power supply has not been inspected by the fire department, the quality cannot be guaranteed, and there is no backup power

Once the AC220V power is cut off and there is no backup power supply, the on-site linkage equipment cannot be started normally

[0012] Moreover, the current wiring method is not only complicated in construction, but also high in cost.

Considering the line voltage drop problem when wiring the DC24V power line, it is necessary to select a copper wire with a suitable diameter, generally 2.5mm 2 Some of the above copper wires even use copper wires with larger cross-sectional areas. Improper selection of wire diameters will cause great hidden dangers to the later use of the system.

During the construction process of the alarm bus and DC24V line, it is easy to have mixed connection and wrong connection, which will cause great difficulties and troubles to the later debugging work and affect the construction progress.

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